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Anionic Polymerization of Vinyl Monomers
Abstract
Addition polymerizations involving soluble organometallic species have received intensive attention in recent years with special reference to the type of counterion and solvent. An anionic mechanism is proposed for those systems where there is good reason to assume that the metal is strongly electropositive relative to the carbon (or other) atom at the tip of the growing chain. Hence, the metal, e.g. lithium, becomes a cation either in the free state or coupled with the growing carbanion. Under the appropriate experimental conditions, spontaneous termination is avoidable in many of those systems when one of the metals of Group I is used as the counterion. The alkali metals sodium and potassium were revealed to be polymerization initiators of isoprene in the disclosures of Matthews and Strange in 1910 and Harries in 1911. The first unambiguous report of the use of lithium in reactions with diolefins appears to be that of Ziegler and coworkers in 1934. Their work consisted of an investigation of the reaction between the alkali metals (lithium, sodium) or alkyllithium species and butadiene, isoprene, 2,3-dimethylbutadiene, or piperylene.
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Park, C., Rosa, C. D., Fetters, L. J., & Thomas, E. L. (2000) · Macromolecules · doi:10.1021/ma000772f · Cited by 49
Self-citationNMR spectroscopy of carbanions and carbocations
Young, R. N. (1979) · Progress in Nuclear Magnetic Resonance Spectroscopy · doi:10.1016/0079-6565(79)80004-7 · Cited by 49
Torres, J. M., Stafford, C. M., Uhrig, D. W., & Vogt, B. D. (2011) · Journal of Polymer Science Part B Polymer Physics · doi:10.1002/polb.23014 · Cited by 48
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Lee, J., Balsara, N. P., Chakraborty, A. K., Krishnamoorti, R., & Hammouda, B. (2002) · Macromolecules · doi:10.1021/ma020361u · Cited by 48
Quirk, R. P., & Zhu, L. (1990) · British Polymer Journal · doi:10.1002/pi.4980230109 · Cited by 48
Alig, I., Floudas, G. A., Avgeropoulos, A., & Hadjichristidis, N. (1997) · Macromolecules · doi:10.1021/ma970101q · Cited by 47
Pitsikalis, M., Hadjichristidis, N., & Mays, J. W. (1996) · Macromolecules · doi:10.1021/ma951001s · Cited by 47
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Long, T. E., Broske, A. D., Bradley, D. J., & McGrath, J. E. (1989) · Journal of Polymer Science Part A Polymer Chemistry · doi:10.1002/pola.1989.080271211 · Cited by 46
Quirk, R. P., & Yoo, T. (1993) · Polymer Bulletin · doi:10.1007/bf00298760 · Cited by 46
Pearson, D. S., Mueller, S. J., Fetters, L. J., & Hadjichristidis, N. (1983) · Journal of Polymer Science Polymer Physics Edition · doi:10.1002/pol.1983.180211106 · Cited by 46
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Watanabe, H., Matsumiya, Y., Sawada, T., & Iwamoto, T. (2007) · Macromolecules · doi:10.1021/ma0712495 · Cited by 45
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Dounis, P., & Feast, W. J. (1996) · Polymer · doi:10.1016/0032-3861(96)85371-7 · Cited by 43
Morgan, A. M., Pollack, S. K., & Beshah, K. (2002) · Macromolecules · doi:10.1021/ma0114178 · Cited by 42
Park, C., Rosa, C. D., Lotz, B., Fetters, L. J., & Thomas, E. L. (2003) · Macromolecular Chemistry and Physics · doi:10.1002/macp.200350018 · Cited by 42
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Quirk, R. P., & Corona-Galván, S. (2001) · Macromolecules · doi:10.1021/ma001044v · Cited by 42
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Graessley, W. W., & Raju, V. R. K. (1984) · Journal of Polymer Science Polymer Symposia · doi:10.1002/polc.5070710109 · Cited by 42
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Litina, K., Miriouni, A., Gournis, D., Karakassides, M. A., Georgiou, N., Klontzas, E., Ntoukas, E., & Avgeropoulos, A. (2006) · European Polymer Journal · doi:10.1016/j.eurpolymj.2006.03.025 · Cited by 41
Jeon, H. S., Lee, J., & Balsara, N. P. (1998) · Macromolecules · doi:10.1021/ma9709718 · Cited by 42
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Lin, C. C., Jeon, H. S., Balsara, N. P., & Hammouda, B. (1995) · The Journal of Chemical Physics · doi:10.1063/1.469720 · Cited by 41
Kamienski, C. W., McDonald, D. P., Stark, M. W., & Papcun, J. R. (2004) · Kirk-Othmer Encyclopedia of Chemical Technology · doi:10.1002/0471238961.1209200811011309.a01.pub2 · Cited by 41
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Zhu, Y., Weidisch, R., Gido, S. P., Velis, G., & Hadjichristidis, N. (2002) · Macromolecules · doi:10.1021/ma020345x · Cited by 39
Kobatake, S., Harwood, H. J., Quirk, R. P., & Priddy, D. B. (1998) · Macromolecules · doi:10.1021/ma9718154 · Cited by 40
Quirk, R. P., & Wang, Y. (1993) · Polymer International · doi:10.1002/pi.4990310109 · Cited by 40
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Schulz, D. N., & Halasa, A. F. (1977) · Journal of Polymer Science Polymer Chemistry Edition · doi:10.1002/pol.1977.170151010 · Cited by 40
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Kuo, C., Saam, J. C., & Taylor, R. B. (1994) · Polymer International · doi:10.1002/pi.1994.210330210 · Cited by 39
Lescanec, R. L., Fetters, L. J., & Thomas, E. L. (1998) · Macromolecules · doi:10.1021/ma971426+ · Cited by 39
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Quirk, R. P., & Kim, J. S. (1995) · Journal of Physical Organic Chemistry · doi:10.1002/poc.610080407 · Cited by 38
Ji, H., Sato, N., Nonidez, W. K., & Mays, J. W. (2002) · Polymer · doi:10.1016/s0032-3861(02)00452-4 · Cited by 38
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Yang, J., & Mays, J. W. (2002) · Macromolecules · doi:10.1021/ma011992b · Cited by 38
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Qi, S., Chakraborty, A. K., Wang, H., Lefebvre, A. A., Balsara, N. P., Shakhnovich, E. I., Xenidou, M., & Hadjichristidis, N. (1999) · Physical Review Letters · doi:10.1103/physrevlett.82.2896 · Cited by 38
Quirk, R. P., & Zhuo, Q. (1997) · Macromolecules · doi:10.1021/ma9610020 · Cited by 38
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Self-citationBenkoski, J. J., Flores, P., & Krämer, E. J. (2003) · Macromolecules · doi:10.1021/ma034013j · Cited by 38
Hong, K., & Mays, J. W. (2001) · Macromolecules · doi:10.1021/ma001926u · Cited by 37
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Chen, J., Lu, Z., Pan, G., Qi, Y., Yi, J.-J., & Bai, H.-J. (2010) · Chinese Journal of Polymer Science · doi:10.1007/s10118-010-9121-y · Cited by 36
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Zhang, W., Sun, B., Li, H., Ren, X., Janoski, J., Sahoo, S., Dabney, D. E., Wesdemiotis, C., Quirk, R. P., & Cheng, S. Z. D. (2009) · Macromolecules · doi:10.1021/ma901506d · Cited by 34
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Lund, R., Willner, L., Lindner, P., & Richter, D. (2009) · Macromolecules · doi:10.1021/ma8021629 · Cited by 34
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Chen, J., Kow, C., Fetters, L. J., & Plazek, D. J. (1982) · Journal of Polymer Science Polymer Physics Edition · doi:10.1002/pol.1982.180200905 · Cited by 34
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Han, C. D., Chun, S. B., Hahn, S. F., Harper, S. Q., Savickas, P. J., Meunier, D. M., Li, L., & Yalçın, T. (1998) · Macromolecules · doi:10.1021/ma971309e · Cited by 33
Lefebvre, A. A., Lee, J., Balsara, N. P., & Vaidyanathan, C. (2002) · The Journal of Chemical Physics · doi:10.1063/1.1511512 · Cited by 31
Liu, S., Jiang, M., Liang, H., & Wu, C. C. (2000) · Polymer · doi:10.1016/s0032-3861(00)00265-2 · Cited by 32
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Schnecko, H. W., Degler, G., Dongowski, H., Caspary, R., Angerer, G., & Ng, T. S. (1978) · Die Angewandte Makromolekulare Chemie · doi:10.1002/apmc.1978.050700102 · Cited by 32
Arnould, M. A., Polce, M. J., Quirk, R. P., & Wesdemiotis, C. (2004) · International Journal of Mass Spectrometry · doi:10.1016/j.ijms.2004.05.014 · Cited by 31
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Rangarajan, P., Haisch, C. F., Register, R. A., Adamson, D. H., & Fetters, L. J. (1997) · Macromolecules · doi:10.1021/ma9603084 · Cited by 29
Self-citationKobatake, S., Harwood, H. J., Quirk, R. P., & Priddy, D. B. (1998) · Macromolecules · doi:10.1021/ma980395v · Cited by 29
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Narros, A., Alvarez, F., Arbe, A., Colmenero, J., Richter, D., & Farago, B. (2004) · The Journal of Chemical Physics · doi:10.1063/1.1772761 · Cited by 28
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Quirk, R. P., Kinning, D. J., & Fetters, L. J. (1989) · Elsevier eBooks · doi:10.1016/b978-0-08-096701-1.00204-4 · Cited by 28
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Lee, J., Quirk, R. P., & Foster, M. D. (2005) · Macromolecules · doi:10.1021/ma050207i · Cited by 27
Hwang, J., Foster, M. D., & Quirk, R. P. (2003) · Polymer · doi:10.1016/j.polymer.2003.11.047 · Cited by 27
Schwahn, D., Richter, D., Wright, P. J., Symon, C., Fetters, L. J., & Lin, M. (2002) · Macromolecules · doi:10.1021/ma0111818 · Cited by 27
Self-citationJayawardena, S., Reyx, D., Durand, D., & Pinazzi, C. P. (1984) · Die Makromolekulare Chemie · doi:10.1002/macp.1984.021851004 · Cited by 27
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Bartoš, J., Šauša, O., Schwartz, G. A., Alegría, Á., Alberdi, J. M., Arbe, A., Krištiak, J., & Colmenero, J. (2011) · The Journal of Chemical Physics · doi:10.1063/1.3578446 · Cited by 26
Quirk, R. P., Janoski, J., Chowdhury, S. R., Wesdemiotis, C., & Dabney, D. E. (2008) · Macromolecules · doi:10.1021/ma8022525 · Cited by 26
Petzetakis, N., Stone, G. M., & Balsara, N. P. (2014) · Macromolecules · doi:10.1021/ma500686k · Cited by 26
Rhee, C., Ferry, J. D., & Fetters, L. J. (1977) · Journal of Applied Polymer Science · doi:10.1002/app.1977.070210318 · Cited by 26
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Penn, L. S., Hunter, T. F., Lee, Y., & Quirk, R. P. (2000) · Macromolecules · doi:10.1021/ma990987t · Cited by 25
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Jeon, H. S., Wyatt, J., Harper-Nixon, D. L., & Weinkauf, D. H. (2004) · Journal of Polymer Science Part B Polymer Physics · doi:10.1002/polb.20131 · Cited by 25
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Narros, A., Arbe, A., Alvarez, F., Colmenero, J., Zorn, R., Schweika, W., & Richter, D. (2005) · Macromolecules · doi:10.1021/ma051466a · Cited by 24
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Kisliuk, A. M., Ding, Y., Hwang, J., Lee, J., Annis, B. K., Foster, M. D., & Sokolov, A. P. (2002) · Journal of Polymer Science Part B Polymer Physics · doi:10.1002/polb.10295 · Cited by 23
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Ndoni, S., Vorup, A., & Kramer, O. (1998) · Macromolecules · doi:10.1021/ma9714225 · Cited by 23
Bywater, S. (1998) · Macromolecules · doi:10.1021/ma970963r · Cited by 23
Batis, C., Karanikolopoulos, G., Pitsikalis, M., & Hadjichristidis, N. (2000) · Macromolecules · doi:10.1021/ma001195y · Cited by 23
Brosse, J., Klinpituksa, P., & Soutif, J. (1992) · Die Makromolekulare Chemie · doi:10.1002/macp.1992.021930202 · Cited by 23
Metadata
- Authors
- Morton, M., & Fetters, L. J.
- Affiliations
- University of Akron (US)
- Venue
- Rubber Chemistry and Technology
- Publisher
- Rubber Division, ACS
- Published
- 1975-07
- Volume
- 48
- Issue
- 3
- Pages
- 359-409
- ISSN
- 0035-9475 (ISSN-L)
- 1943-4804
- OpenAlex
- W2176601295
- Cited by
- 461
- References
- 0
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 4 · 2022: 1 · 2021: 4 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 4 · 2014: 2 · 2013: 7 · 2012: 11
- FWCI
- 6.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Rubber Chemistry and Technology (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Chemistry › Organic Chemistry › Coordination Chemistry and Organometallics
- Physical Sciences › Chemistry › Organic Chemistry › Organometallic Complex Synthesis and Catalysis
- Keywords
- anionic polymerization, vinyl monomers, organometallic initiators, alkali metal counterions, lithium, sodium, potassium, carbanions, spontaneous termination, isoprene polymerization, butadiene polymerization, dienes, lithium alkyls
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